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<head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <link rel="stylesheet" href="./CSS/index1.css">
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<body>
        <div class="box5">
                <div class="button">
                        <div class="add">添加元素</div>
                        <div class="cancel">删除元素</div>
                </div>
                <ul class="list3">我是ul3
                        <li>我是li1</li>
                        <li>我是li2</li>
                        <li>我是li3</li>
                </ul>
        </div>
        <script src="./js/index1.js"></script>
</body>

</html>